61405775 has 12 divisors (see below), whose sum is σ = 77188512. Its totient is φ = 48450240.

The previous prime is 61405709. The next prime is 61405783. The reversal of 61405775 is 57750416.

It is not a de Polignac number, because 61405775 - 2¹⁸ = 61143631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14999 + ... + 18648.

It is an arithmetic number, because the mean of its divisors is an integer number (6432376).

Almost surely, 2^61405775 is an apocalyptic number.

61405775 is a deficient number, since it is larger than the sum of its proper divisors (15782737).

61405775 is a wasteful number, since it uses less digits than its factorization.

61405775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33730 (or 33725 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 61405775 is about 7836.1837012668. The cubic root of 61405775 is about 394.5206490927.

The spelling of 61405775 in words is "sixty-one million, four hundred five thousand, seven hundred seventy-five".